How to calculate pro rata without sharecount?

Might be overthinking this...


If you have a new round of financing, dilution is: new raise/post-money valuation. But how do you calculate the additional capital you need to put in to get back to your ownership if you don't have a cap table? 

 

If you have the post money value and know the issuance price of the most recent round you most likely should be able to back into the number of shares issued assuming no options/warrants were  issued in the transaction. You can then get a rough estimate of a pro forma cap table and goal seek your shares purchased in the latest round to make your ownership % equal to the existing % with the estimated pro forma cap table. 

 

You just participate in the new round with the percentage holding that you have pre-raise.

Let's say your percentage holding is p, and assume the dilution is d=raise/post-money. In other words the company is selling d percent to the new investors.

Without participation in the round your new shareholding percentage would be p_new = p(1-d)

By participating in the new round with your shareholding your new holding would be p_new = p(1-d) + p*d = p

So the new percentage holding is the same as the old.

 

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